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A cut blade and a complete spare are different requests
The word duplicate can suggest making another piece of metal with the same shape. For a vehicle key, the useful question is which functions the finished item needs to perform. Depending on the vehicle, physical access, starting, and remote operation may involve different parts of the key arrangement. Explain your expected result in practical terms rather than assuming that copying a blade creates a complete equivalent key.
If a quoted option has limited functions, ask what those limits mean in everyday use. A way to open a door is not automatically a way to start the vehicle. Similarly, a remote shell is not a complete working remote just because it resembles the original. The scope of the quotation should make clear what is supplied and which functions are included.
For a spare intended for regular driving, discuss the whole key rather than one preparation step. If you already bought a blank or fob, mention that before requesting a quote. Ask whether it is appropriate for the vehicle and what additional work would be needed. This makes it easier to compare a complete option with a customer-supplied item on a fair basis.